Device Management Part 2

Question 1

Devices that can directly read or write to a specific place.

Answer 1

Direct Access Storage Devices (DASD)

Question 2

Direct Access Storage Devices are grouped into 3 categories

Answer 2

• Magnetic disks (Fixed-Head, Movable-Head)
• Optical discs
• Flash memory

Question 3

Although the variance in DASD access times isn’t as wide as with ______, the location of the specific record still has a direct effect on the amount of time required to access it.

Answer 3

magnetic tape

Question 4

• Looks like CD or DVD covered with magnetic film that has been formatted.
• Each circle is called track.
• Data is recorded serially on each track by the fixed read/write head position over it.

Answer 4

Fixed-Head Magnetic Disk Storage

Question 5

Each circle in fixed-head magnetic disk storage is called a _____

Answer 5

track

Question 6

• Faster than movable-head disks
• Used when speed is of the utmost importance
• High costs
• Reduced storage space compare to movable disk

Answer 6

Fixed-head magnetic disk storage

Question 7

• Like a computer hard drives.
• Have one read/write head that floats over each surface of each disk.
• Disk can be a single platter or part of a disk pack/stack of magnetic platters.
• The number of tracks typically a thousand or more

Answer 7

Movable-Head Magnetic Disk Storage

Question 8

identifies the
outermost concentric circle on
each surface

Answer 8

Track 0

Question 9

A ______ is a stack of magnetic platters. The read/write heads move between each pair of surfaces, and all of the heads are moved in unison by the arm.

Answer 9

disk pack

Question 10

A disk pack is a stack of _______. The read/write heads move between each pair of surfaces, and all of the heads are moved in unison by the arm.

Answer 10

magnetic platters

Question 11

On a magnetic disk, the sectors are of different sizes: _____ at the rim and ______ at the center.

Answer 11

bigger, smaller

Question 12

On a magnetic disk, the sectors are of different sizes: bigger at the rim and smaller at the center.

The disk spins at a _______ to compensate for this difference. Some optical discs can read and write on multiple layers, greatly enhancing storage capacity.

Answer 12

constant angular velocity (CAV)

Question 13

• Was made possible by developments in laser technology.
• Single spiraling track of same-sized sectors.
• Running from the center to the rim of the disc.

Answer 13

Optical disk storage

Question 14

Consists of a single spiraling track of same-sized sectors running from the center to the rim of the disc.

Answer 14

Optical disc

Question 15

On an optical disc, the sectors (not all sectors are shown here) are of the same size throughout the disc. The disc drive changes speed to compensate, but it spins at a _____.

Answer 15

constant linear velocity (CLV)

Question 16

To put data on an optical disc, a high-intensity laser beam burns indentations on the disc that are called ____.

Answer 16

pits

Question 17

Pits, which represent 0s, contrast with the unburned flat areas, called ____, which represent 1s

Answer 17

lands

Question 18

A magnetic disk, which consists of concentric tracks of sectors, spins at a constant speed—this is called ______

Answer 18

constant angular velocity (CAV)

Question 19

The disc drive adjusts the speed of the disc’s spin to compensate for the sector’s location on the disc—this is called ______

Answer 19

constant linear velocity (CLV)

Question 20

• A type of electrically erasable programmable read-only memory (EEPROM).
• A nonvolatile removable medium that emulates random access memory, but, unlike RAM, stores data securely even when it’s removed from its power source.

Answer 20

Flash memory storage

Question 21

EEPROM means

Answer 21

Electrically Erasable Programmable Read-Only Memory

Question 22

EEPROM means

Answer 22

Electrically Erasable Programmable Read-Only Memory